4 Gate sucks, it takes too long to build up, 1v1, if you are going to rush with toss, you should rush 4 zlots from your base and micro them like crazy inside the enemy's base (inflicting as much damage as possible) while you tech up and expand... Or go all-in and Proxy Rush, a 4 Gate can get beaten so easily by Marauders with concussive shells, and roach/zergling masses.
I like to sneak expo my enemy and fortify it heavily, so if you're making Immortals, air, or Colossi, you can keep hitting them over and over again from point blank distance.